Electrical double-pole switching plug



Sept. 18, 1923. 1,46%,577

' H. C. SANDERS ELECTRICAL DOUBLE POLE SWITCHING PLUG Filed April- 23. 1921 M r u l/ I I 1 if r In Patented Sept. 18,

STATE OLD CUETICF] SANDERS, IPORT, ENG a. N

was??? A. 'F H-CIEQ 1' TRICAL DOUBLE-POLE SWITCH! f4 PLUG,

Application filed A ril at, 1921. am no. ceases.

in the county of Monmouth, England, have invented certain new and useful Electrical Double-Pole Switchin Plugs, of which the following is a spec' cation.

This invention relates to a switching plug for the purpose of establishing and controlling electrical circuits; The switching plug. is designed to provide a connection between any fixed point and such apparatus as are usually connected by flexible cord, and pos sesses the following advantages (a) The switch action provides a quick make and quick break on each pole.

' (a) The speed of make and break is entirely outside of the control of the operator. (6) The plug cannot be withdrawn unless v the curent' is'broken by quick action on each ole. p (c) 'lheplug cannot be inserted with the switch closed. $5) No live parts exposed to touch.

he switching plug comprises a base and a lug. 1 lhe base is constructed of a suitable insu lating material carrying-two metallic terminals and a cover of insulating material, or-a metallic cover suitably lined. The base and=cover are provided with acentral hole to receive the plug, and the cover has two apertures in its face through which the plug contact blades enter.

The plug body is of insulatingmaterial and has a central hole provided for the 'f'being anchored, one to the said handle, an

reception of the flexible cable, the ends of which are attached to the plug contact blades. it loose handle isprovided around the" other to the plug body or on the same fixed pin on the plug body. A locking pawl or spring catch is provided to prevent the plu ,body rotating until the spring is wound to t e required extent, wherear the said of England,-

pawl or catch is automatically withdrawn allowing the main spring to rotate the plug body during that part 0 a circle required to complete the aforementioned quick make or quick break.

'l he plug and base are so arranged that the plug contact blades themselves form the switch blades, which, on entering the apertures in the cover and receiving the said semi-rotary motion close the electrical 'circult and prevent the withdrawal of until its return to the OE ition, which is attained by the winding 0 the spring by the loose handle in the opposite direction to that used in closing the circuit.

In the. accompanying drawings Fig. 1 is asectional elevation of my improved double pole rotary switchin plug;

Fig. 2 is a plan of the same part y broken away to show the manner in which the ends of the spring are engaged by a pin on the loose handle A; and Y Figs. .3 and 4 are sections taken on. the lines 3-3 and 4-4 respectively in Fig. 1.

Fig. dis a view showing the plug in section to illustrate the structural-relation between the' handle, the plug,-and the plug contacts.

Fig: 6 is a view showing the receptacle contact.

The same parts are lettered to'correspond in all fourfigures.

My improved rotary switching plug comprises four principal parts, namely the rotor A, the loose handle Bmounted' on the rotor, the base G and the base cover D.

The rotor A carries two contact blades l diametrically located around the central cylindrical body of the rotor and adapted to engage with terminals H in the base 0. These blades l are a'ssed' through apertures D", made in the use fl and base cover D, and opening into an annular recess K in the plug the-haw C in which recess the terminals H are secnred in the ordinary way." 'e contact blades I are connected to flexible cables, wires, or the like leadingto the apparatus to be electrically connected with the circuit its of which carries, or is provided with, two

projecting teeth or stops G between which plates the spring A is located.

B which The loose handle B carries a pm passes between the projecting ends A of the spring and the said pin connects the loose handle B with a catch releasing plate L..

This plate L rovidedwith cams or flat surfaces L adap ed when rotated to engage the spring catch E and force same back out "of the keeper or notch F in the base cover into its radial housing E;-

The operation is as follows :-The plug is inserted into the base C by passing its contact blades through the apertures D into the annular recess K. The handle B is then rotated which by means of the pin B" puts one end of the spring A under tension while the other end remains stationary against the "fixed pin A, the rotor A being held against rotary movement by the spring catch E engaging in the keeper F. the handle has been rotated sutficiently to bring the cam or flatted surfaces L against 3 the catch E the latter is depressed into its housing. and the rotor thereupon rapidly rotates under the influence of the tensioned 1 spring until the contact blades I engage in the terminals H in the base C, the sprin catch E resting in one of the apertures D where it is again de ressed into its housing by the reverse rotation of the loose handle B. It will be observed that the stops G a on the plates G and G, prevent the pin B, and consequently the loose-handle B, from rotation beyond a quarter of a circle, the

rotor making a similar movement of 90 degrees in the same direction after the move-' 'ment of the handle has ceased.

I claim: '1. An electric switch plug, includinga base having a. pair of contacts therein, a rotor provided with a'pair of contacts for ,en ement with the contacts in the base adap ed for removable connection with the base when the contacts are out "of engage: ment, means for locking -said rotor against rota movement in the base, a'h'andle rotatab y mounted on the rotor having means for releasing the first-mentioned means, and

operating means within the handle for'rotating the plug afterthe handle has been rotated for releasing the. first-mentioned means. 4

2. An electric switch .plug, including a When base having a pair of contacts therein, a rotor provided with a pair of contacts for engagement with the'contacts in the base an adapted for removable connection with the base when the. contacts are out of engagement, means for locking said rotor against rotary movement in the base, and a handle rotatably mounted on the rotor containing means for releasing said locking means and rotating the rotor thereafter controlled bythe rotary movement of the handle.

3. A detachable electric switch, comprising a base havin a pair of contacts therein, a rotor removab y mounted in the base and provided with the contacts in the base, a spring actuated latch carried by the rotor and engaging a seat in the base, a hollow handle formed with cam surfaces adapted V to cooperate with the latch, a spring mounted on the rotor and housed within the handle, and means on the handle toengage the spring" to place same under-tension to rotate the rotor when one of the cam surfaces engages and'releases the latch.

4. A detachable electric switch, comprising a base having a pair of contacts therein, a central recess, and slots extending from the recess disposed at points between the contacts, a rotor removably inserted in the recess in the base haiving a. pair ,of switch blades thereon ada ted to'engage the contacts in the base an passihrough said slots when the contacts are disengaged for the removal of the plug from the base, a spring pressed latch carried by the rotor and adapt- 'ed to engage a notch in the base, ahandle rotatably mounted on the rotor having means for releasing the latch, and resilient means mounted on the rotor and connected with the handle, and tensioned by the handle in the rotation thereof for rotating the rotor in the body when" the means on the handle releases the latch from the notch in the bod 5. A det achable .electric switch, comprise ing a base having a' central recess, an annular recess communicating therewith, and oppositely disposed slots communicating with the annular recess, oppositely disposed contacts mounted in the annular recess in the base at right angles to the slots, a rotor rotatably and removably mounted in'the central recess in the'base having a'pair of contact blades extending from opposite'fpoints on-the periphery thereof for en agement .with the contacts in the base an permitting the removal of the rotor from the base when opposite the slots, a spring pressed latch carriedby the rotor for engagement in a recessinthe base, a handle rotatably mounted on the rotor having cam surfaces adapted to engage the latch to release it'from the recess .m the base, and a spring member mounted on-therotor within the handle having the end portions engaging on each side of e pin my hand in presence of two subs cribing Witextending eeflhlgough the handle adapted dto nesses this 30th day of March, 1921. he tension y the notation of the ham 1e 4 for turning the rotor in the base when a HAROLD CURTICE SANDERS cam surface on the handle releases the latch itnesses: from a notch in the base. RAYMOND 1?. Emma,

In testimony whereof I have hereunto set QLAUDE O. Jmme. 

